NEED HELPP WITH ONLINE

I have a cable modem. With a USB port, power cable, ethernet (for ps2 online) . My usb port goes to the back of my pc and my ethernet is hook up to the network adapater for my PS2. My internet connects and everything, but I get a error (Network ERROR (-612) ).

It says DNAS not responding or something like that. And also, I install on by going to "Play Online", I didn't put the start up disc in.